Grinding machine



' June 9, 1925.

. 1,540,794- R. c. MITCHELL GRINDING MACHINE Filed A'UE-j 16, 1920 3 Shuts-Sheet i June 9, 1925. 1,540,794

R. c. MITCHELL GRINDING MACHINE Filed Aug, 16, 1920 3 Sheets-Shut 5 Patented June 9, I925.

UNITED'STATES GRINDING onto, assienon, BY MnsNn Assn-immune, TO-BARBER-COLMA1\T COMPANY; A. con-nona'rron or" ILL NOIS-1 MACHINE. i

Application filed August 16, 1920. Sara mama.

T all whom it may concer /i: Be it known that, I, RAYMOND CL MITCH- ELL, a citizen of the United States, residing at Springfield, in the county of Clark and State of Qhio, haveinventedcertain new and useful Improvements in Grinding Machines, of which the following is a specification. I

My invention relates to work driving means for grinding machines and the like, wherein the work is rotated as it is fed past a working tool, In grinding machines for plain cylindrical or tapered work, such as the machine herein shown for illustration of my invention, it is usual to mount the grinding wheel: at "a relatively fixed station and to recijpirocatein front of the grinding wheel station a table carrying the headstock and tail-stock, between which the rotatable wom n mounted; Gust-omarily, in such constru vctionsfll e rotary element ojt' the head-stock, for driving the work, is driven abelt or other frictional driving arrangelnentfthat is exterior to the frame of the machine.

An object of'my invention is to provide a novel positive driving mechanism in connection with ahead stock, reciproeable with the work carrying table, doing" away with belting, and building the mechanism int-o the machine with minimum exposure of running parts. One construction embody- ,ing my invention is shown in the acconr panying drawings, wherein Fig. I is a front elevation ofa grinding machine; Fig, 2 is a plan view of the head-stock end thereof; Fig. 3 is a fragmentary vertical sectional elevation of parts shown at the left in; Fig. 2,; Fig, 4 is. a fragmentary vertical section of portions of the macliine' insubstantial continuation to" the right of the construction shown in Fig. 3; Fig, 5. is a vertical cross-section on line 55, of Fig. 3; 6 is, a vertiealsection on line '6-6- of Fig,,4.

In known fashion, the machine base 10 carries the slide-table llto be automatically reciprocated in front of a grinding wheel at station 12. The, grinding wheel, of

automatic micrometer feed transversely to the path of travel of the workaud for other manuai and automatic tnnctioning appropriate to this type of niechzinismybut these details are not shown herein as: my present inventionhas'no concern with them and in these regards construct-ions that are old and well-knownjin the art may be used. Also a will be understood" tha fth work-table equipped on itsunder side with a rack 13, may be hand-moved or automatically reciprocated through variable range of stroke by: gearing 14,.wh1ch may receive power. in any suitable fflSlllOIl, as from exterlormulti- 'stepfpulley 15, the power train including usual manually oontrolled speed-changing gearing the table-travelbeing governed by automatic reversing meohanisn'i, controlled to: vary its throw, by "the usual tr p-dogs All of thesevarious devices also may be ofknown. construction which it is unnecessary here to illustrate or describe in full, as, they are well understoodin the art. a i

t The tail stook-unit 17 and the head-stock unit 18, carried by the reciprocatory table 11 are mounted thereon for loiigitudinah adjustment to accommodate work of different lengths between their center-points and for lateral adjustment to, vary theangleof presentation of the work with respectfito the grinding wheel, and these capabilities may be afforded by structures of acharacter well known in the art. The details ofsuch adljustable mounting may vary, but the construct1on illustrated provides, on the'slide table, a'plate. l9j'pivoited centrallyas at 20 for angular adjustment of the workrel'a- :tive to thelongitudinal line ofitr avel of the table, its ar cu-ate ends 21' being adaptedqto be clamped in adjaisted positions, or different angular settings,in the clamp-guides 22; The head-stock and tail-stockare lone git-udinally 3 slidable on such plate 19 in usual fashion, and may be clamped in lon-' gitudinally adjusted position thereon as by known constructions.

It will'be understood, also, that shopmach inery other than grinders maypresent work-handling-mechanism of kindred v g I ,sort to that-described and that my invencourse, is preferably mounted for the usual O adjustments, and equipped for hand and tion is not' restricted' specifically to the mechanism illustrated in the matters thus described. 7 1

Novelty, I provide in conjunction'with a ,means of clamping bolts 23 all typicahot' inga reciprocable work table and a longitudlnally and laterally adjustable headstock, as above generalized, positive built-in 'gearing for driving the head stock at different selectlve speeds, arranging the driv ing means to accommodate the various adjustments of the head stock and also the bodily reciprocation of the head stock with the slide-table as above described. Specifically, represents the rotatable work:

. different transverse and angular positions owing to the adjusting movement of the head stock, it is made with two sections 29 and 29 flexibly connected by a suitable universal joint 31 the shaft-section 29" being mounted to slide through but rotate with a beveled gear 33 to which power is communicated from bevel gear 34 faston the vertical shaft 35 which constitutes a positivelypositioned part on the table for actuating the movably-positioned parts. This shaft 35 extends down below the level of slide table 11 and its lower end is connected by beveled gears 36, 37 with a. longitudinal table-carried, main shaft 38 to which power is applied by base-carried gearing, in the manner hereinafter described. I

An advantageous construction for the mounting of these table-carried gearing and shaft parts is illustrated in Fig. 3. Block 40 secured to the slide table has sleeve 41 to afford adequate bearing for the long hub 37 of gear 37 which is contained in the grease-chamber 42 of the block, to which chamber access may be had through the end cap 43; and on the block 40ris mounted a vertical standard or hollow post 44 affording at its lower and upper ends bushed bearings for the shaft 35. The top of standard 44 has a reduced portion or pivot-end 44 on which may turn the collar 45 of a horizontally-disposed elongated housing 46 that is long enough to. accommodate the section 32 of flexible shaft 32-29 and to give such shaft ample range of axial movement. A cap 47, closing the front opening of the housing 46 affords adequate bearing for the elongated hub 33 of the gear It will be understood, of course, that as the head-stock is usted transversely the housing 46 turns pivotally and gear 33 may planet slightly around the gear 34; theshaft-section 29 sliding throughthe gear 33 to accommodate this slight change of relative position (or sliding more to accommodate any longitudinal adjustment of the headstock on the swing plate 19) so that the positive drive connections from the positively positioned gear 34, including flexible shaft 29 and its sliding connection with gear 33, permit of all requisite movements of the head-stock without loss of connection.

The table-carried main shaft, 38, is geardriven from a power shaft on the base lO, preferably through speed-changing gearing. The shaft 38, where it extends beyond the block 40, is made of square or other non-circular section (Fig. 5) and within the base 10 of the machine it engages the squared aperture of a gear 50, the long hub of which is adequately journaled in a bracket 51 that extends transversely across the base near the center thereof. This shaft may also extend through and bear in the end wall 52 of the base 10. Power is applied to the gear through base-carrieddriving connections as follows: A multi-speeol pulley 53 mounted on apower-shaft 54 (Figs. 4 and 6) communicates power through pinion 55 to a gear 56 that is mounted on a shaft 57, journaled in the brackets 51 and 58 of the base. Be-

tween this shaft 57 and gear 50 on the slide ing shaft 38 a change speed gearing is arranged, illustrated as a two speed construction, although (if direct motor drive for the power shaft be employed in lieu of the multi-speed pulley53) the number of speed changes may be suitably increased. As shown, a sliding clutch element 60 on the shaft 57, rotatable with said shaft and controlled by a shipper-lever 61, may engage the clutch-hubs of either thesmall gear 62 or the large gear 63 loose on shaft 57 and respectively meshing with large gear 64 and small pinion 65, these being fast on an intermediate shaft or jack-shaft 66 that is journaled in the brackets 51 and 58, the gear 64 meshing with that gear, 50, through which the shaft 38 slides. Of course the shipper lever 61 is controlled from the exterior of the machine, as by suitable link connections 67 to handle 68, so that the driving pulley 53 may be connected through either the lower-speed train 62, 64 or the higher-speed train 63, 65, 64 with the driving gear 50 for the shaft 38 that in turn drives the working element of the head stock. I

It will be apparent that by the construction described I provide a simple, rugged and eflicacious gear drive for the head stock that is as durable and free from liability to slippage or other disorders as is possible, and that in so doing I clear the head stock end of the machine of objectionable belting connections and other impedimenta that have generally been employed in connection with the driving of the head stock.

While I have herein described in some detail a particular construction which I have tion may be made without departure from the spirit of my invention withinthe scope of the appended claim.

I claim: I

A grinding machine having, in combination, with a base and a table reciprocable on the base, a shaft mounted to turn on a vertical axis at one, end of the table, a plate pivoted on the table and having a head stock at the end adjacent said shaft and swingable transversely with the plate relative to the vertical shaft on the table, said head stock being mounted for longitudinal adjustment on the plate and having a horizontally disposed work driving element, said vertical shaft having its lower end passing through the table and terminating a substantial distance above the table, a horizontal longitudinally extending shaft having a gearing connection with the upper end of said vertical shaft, said gearing connectlon permitting the horizontal shaft to swing in a horlzontal also permitting the longitudinal movement of the horizontal shaft in a direction per pendicular to the axis of the vertical shaft, a flexiblecoupling between said horizontal shaft and'the' driving element of the head stock, said coupling being adapted to permit the head stock to be swung bodily rela- RAYMOND C. MITCHELL.

. plane on the axis of said vertical shaft and c 

